Question

以下是我的 SP ：

Alter PROCEDURE GetList 
(

@FromDate date = null,
@ToDate date = null

)
AS

Select * FROM CallList c
Where c.CallDate > @FromDate and c.CallDate < @ToDate

如果没有通过日期过滤器，我想获取所有记录。

我该怎么办？

Answer 1

你可以这样做：

SELECT * FROM CallList c
WHERE (c.CallDate > @FromDate OR @FromDate IS NULL) AND 
      (c.CallDate < @ToDate OR @ToDate IS NULL)

这也让你可以将其中一个日期留空而不是另一个日期。

Answer 2

你会做以下

SELECT * 
FROM CallList AS C
WHERE (@FromDate IS NULL OR c.CallDate > @FromDate)
AND (@ToDate IS NULL OR c.CallDate < @ToDate)

Answer 3

一些可行的选择：

您可以将@FromDate和@ToDate分别设置为非常早或非常晚的日期，它们都是NULL。

您可以使用sp_executesql并根据需要构建带有参数的动态查询字符串，例如

DECLARE @Sql NVARCHAR(MAX) = 'SELECT * FROM CallList C WHERE 1 = 1 '

IF @FromDate IS NOT NULL
BEGIN
  SET @Sql += ' AND C.CallDate > @xFromDate'
END

IF @ToDate IS NOT NULL
BEGIN
  SET @Sql += ' AND C.CallDate < @xToDate'
END

EXEC sp_executesql @Sql, N'@xFromDate DATETIME, @xToDate DATETIME', @xFromDate = @FromDate, @xToDate = @ToDate

后一种方法比在整个地方使用OR更好，因为包含OR的查询总是最终得到非常好的优化 - 它们可能适用于某些参数集，但通常不是一刀切的

Answer 4

尝试以下方法：

SELECT
    *
FROM
    CallList c
WHERE
    ( @FromDate is null AND @ToDate is null ) OR
    ( @FromDate is null AND c.CallDate < @ToDate ) OR
    ( @ToDate is null AND c.CallDate > @FromDate) OR
    ( c.CallDate > @FromDate AND c.CallDate < @ToDate )

此外，如果您正在寻找两个时期之间的交集，请不要忘记选择以后的 FromDate 和之前的 ToDate 。

Answer 5

每次动态sql都是complie，所以要防止使用动态sql

    select * from calllist As c
    where (c.CallDate < @ToDate or @ToDate is null)
and  (c.CallDate > @FromDate or @FromDate is null)

Answer 6

DECLARE @BgnDate date,
 @EndDate date

SELECT @BgnDate = MIN(c.CallDate),  @EndDate = MIN(c.CallDate) FROM CallList

Select * FROM CallList c
Where c.CallDate > ISNULL(@FromDate,@BgnDate) 
and c.CallDate < ISNULL(@ToDate,@EndDate)

Answer 7

你也可以使用BETWEEN（短手小于或等于，大于或等于）：

declare @ToDate varchar(12)=null,
    @FromDate varchar(12)=null

select * from calllist As c where c.CallDate between 
CONVERT(datetime, isnull(@ToDate,c.CallDate)) 
and CONVERT(datetime,isnull(@FromDate,c.CallDate))

如果参数为null，如何返回所有记录

7 个答案: